An automatic water supplementing and anti-blocking device for a raw flue slurry discharge pipeline of a thermal power plant

Abstract

The utility model relates to a thermal power plant flue slurry discharge system technical field especially to an automatic water replenishing and anti -blocking device for the original flue slurry discharge pipeline of the thermal power plant. Including original flue slurry discharge pipeline, U -shaped pipe and supporting assembly. U -shaped pipe stores desulfurization process water, and its import section communicates with original flue slurry discharge pipeline, and the curved section is connected with the preceding process through the water replenishing pipeline, and the pipeline is equipped with negative pressure valve, and the export section connects the post -process, and is equipped with the deslag valve in the import and export section junction. The curved section of U -shaped pipe is composed of the venturi pipe of two export sections communication, and the export section and import section diameter ratio of venturi pipe is 1:3; The water replenishing pipeline is equipped with the water replenishing branch pipe with manual valve, and the import and export of branch pipe are separately arranged on the upstream and downstream of negative pressure valve; The included angle of the curved section of U -shaped pipe and the horizontal plane where the export section is 40 °-70 °.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas slurry discharge systems in thermal power plants, and in particular to an automatic water replenishment and anti-clogging device for the original flue gas slurry discharge pipelines in thermal power plants. Background Technology

[0002] During the operation of thermal power plants, to prevent the desulfurization slurry from deteriorating, foaming, and overflowing into the original flue gas duct, causing damage to the fans, a slurry discharge pipe is usually installed at the connection between the original flue gas duct and the absorption tower. A U-shaped pipe is installed at the bottom of the pipe for water sealing. This water seal can prevent flue gas leakage and also achieve automatic slurry discharge when slurry returns from the original flue gas duct. However, under long-term stable operation, factors such as water vapor evaporation and poor sealing can cause the water level in the U-shaped pipe water seal to continuously decrease. In addition, traditional electrically controlled water supply valves are prone to corrosion and blockage by media such as desulfurization slurry, leading to frequent failures, which in turn cause water seal failure and gas leakage, seriously threatening environmental safety.

[0003] Currently, existing slurry discharge pipeline water seal systems mainly include U-tube gravity water seals, electrically controlled water supply valves, and bypass sewage systems. The U-tube water seal relies on gravity to maintain the water level, but requires periodic manual water replenishment; the electrically controlled water supply valve monitors water level changes using a float sensor or level gauge, triggering a solenoid valve to replenish water; and the bypass sewage system is used for periodic manual cleaning of pipeline sediment. However, these existing solutions still have significant drawbacks: first, the electrically controlled valves rely on continuous power supply, posing a significant safety hazard in the harsh environment of desulfurization areas; second, the float sensor is easily adhered to by slurry, leading to monitoring failure, and the solenoid valve requires frequent replacement due to corrosion, resulting in high maintenance costs; third, their functions are limited, only achieving water level control, failing to effectively solve the problem of slurry discharge pipeline blockage, and thus failing to meet the actual needs of safe and stable operation of thermal power plants. Utility Model Content

[0004] To address the problems of existing slurry discharge pipe water seal systems, such as reliance on power sources, safety hazards, limited functionality that fails to solve slurry deposition and blockage issues, high maintenance frequency, and poor reliability in high-temperature and corrosive environments, it is imperative to improve and optimize related technologies. This utility model proposes an automatic water replenishment and anti-blockage device for the original flue slurry discharge pipes of thermal power plants.

[0005] The present invention specifically adopts the following technical solution:

[0006] An automatic water replenishment and anti-clogging device for the slurry discharge pipeline of a thermal power plant's original flue gas duct includes the original flue gas duct slurry discharge pipeline located near the original flue gas duct and absorption tower, and a U-shaped pipe containing water. A slag discharge valve is installed at the lowest point of the U-shaped pipe. The inlet section of the U-shaped pipe is connected to the original flue gas duct slurry discharge pipeline. A water replenishment pipeline is connected to the bend section of the U-shaped pipe, and the outlet of the water replenishment pipeline is connected to the bend section of the U-shaped pipe. The water replenishment pipeline is equipped with a negative pressure valve. The outlet section of the U-shaped pipe is connected to a downstream process.

[0007] Preferably, the curved section of the U-shaped pipe is composed of two Venturi tubes, and the outlet sections of the two Venturi tubes are connected; the water supply pipe is connected at the junction of the two Venturi tubes.

[0008] Preferably, the ratio of the diameter of the outlet section to the diameter of the inlet section of the two Venturi tubes is 1:3.

[0009] Preferably, the water supply pipe is connected in parallel with a water supply branch pipe, and the water supply branch pipe is equipped with a manual valve.

[0010] Preferably, the negative pressure valve is a negative pressure triggered diaphragm valve.

[0011] Preferably, the angle between the curved section of the U-shaped tube and the horizontal plane where the outlet section of the U-shaped tube is located is set to 30° to 70°.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. This invention utilizes a Venturi tube structure, based on the Bernoulli effect, to create a negative pressure zone at the connection point of two Venturi tube sections, driving the water supply pipe to automatically draw water without external power. Simultaneously, the specific inclination angle of the U-shaped tube's curved section relies on gravity to assist in slurry discharge, reducing dependence on a power source. This frees the device from the limitations of traditional electrical control components, avoids the risk of electrical failures in harsh environments, and the mechanical valves ensure high reliability, significantly extending maintenance cycles.

[0014] 2. This utility model organically integrates water replenishment and anti-clogging functions. The Venturi tube automatically triggers water replenishment in the negative pressure zone, and the water replenishment branch pipe and manual valve provide redundant protection, ensuring a stable water seal height. The inclined design of the U-shaped pipe, the slag discharge valve, and the Venturi effect accelerate fluid scouring of the pipe's inner wall, effectively promoting slurry flow, reducing sedimentation, cleaning impurities, and preventing scaling. Compared to traditional solutions that require separate maintenance of the water replenishment and anti-clogging systems, this device achieves functional coupling through structural optimization, extending the maintenance cycle to more than 3 months and ensuring stable system operation.

[0015] 3. This utility model eliminates the need for electrical control components such as float sensors, solenoid valves, and control cabinets, retaining only mechanical valves and piping structures, and optimizing material selection. Compared to traditional solutions, the initial investment is significantly reduced, while maintenance costs are greatly reduced. No professional electrician is required for maintenance, resulting in a 40% reduction in equipment cost. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an automatic water replenishment and anti-clogging device for the original flue slurry discharge pipeline of a thermal power plant, according to the present invention.

[0017] In the diagram: 1. U-shaped pipe; 2. Water supply pipe; 3. Negative pressure valve; 4. Slag discharge valve; 5. Water supply branch pipe; 6. Manual valve; 7. Original flue slurry discharge pipe. Detailed Implementation

[0018] An automatic water replenishment and anti-clogging device for the original flue slurry discharge pipe of a thermal power plant includes an original flue slurry discharge pipe 7 installed near the original flue and absorption tower, and a U-shaped pipe 1 containing water. A slag discharge valve 4 is provided at the lowest point of the U-shaped pipe 1. The inlet section of the U-shaped pipe 1 is connected to the original flue slurry discharge pipe 7.

[0019] The curved section of the U-shaped pipe 1 is connected to a water supply pipe 2. The outlet of the water supply pipe 2 is connected to the curved section of the U-shaped pipe 1. The water supply pipe 2 is equipped with a negative pressure valve 3. The negative pressure valve 3 is a negative pressure triggered diaphragm valve. The water supply pipe 2 is connected in parallel to a water supply branch pipe 5, and a manual valve 6 is installed on the water supply branch pipe 5.

[0020] The outlet section of U-shaped pipe 1 is connected to the subsequent process. The curved section of U-shaped pipe 1 consists of two Venturi tubes, and the outlet sections of the two Venturi tubes are connected; the water supply pipe 2 is connected at the junction of the two Venturi tubes. The ratio of the diameter of the outlet section to the diameter of the inlet section of the two Venturi tubes is 1:3. The angle between the curved section of U-shaped pipe 1 and the horizontal plane where the outlet section of U-shaped pipe 1 is located is set to 30° to 70°.

[0021] Under normal operating conditions, the slurry flow rate in the original flue gas slurry discharge pipe of the thermal power plant remains stable. The liquid flow in the two Venturi sections of the U-shaped pipe 1 is smooth, and the pressure difference in the Venturi section is less than the opening threshold of the negative pressure valve 3. At this time, the negative pressure valve 3 is in the closed state. The desulfurization process water stored in the U-shaped pipe 1 forms a stable water seal, and the water seal height is maintained at H=30cm, effectively preventing gas leakage in the flue gas duct and ensuring the safe and stable operation of the system.

[0022] When the water seal in U-tube 1 evaporates due to environmental factors or a pipeline leak occurs, causing a decrease in water seal height ΔH ≥ 5 cm, the liquid flow velocity in U-tube 1 will increase accordingly. This increased flow velocity leads to changes in the pressure distribution within the two Venturi sections, with the pressure difference in the Venturi section gradually increasing. When the pressure difference reaches the opening condition of negative pressure valve 3, valve 3 automatically opens, connecting the water supply pipe 2 to the upstream process, and desulfurization process water begins to be injected into the curved section of U-tube 1 through the water supply pipe 2. As the water supply process continues, the liquid flow velocity in U-tube 1 changes accordingly, and the water supply volume automatically adjusts according to the liquid flow velocity, achieving adaptive flow rate changes until the water seal height returns to normal, the pressure difference in the Venturi section decreases, and negative pressure valve 3 closes again.

[0023] Furthermore, to prevent sediment buildup and blockage in U-shaped pipe 1 and the original flue gas slurry discharge pipe, the device is designed to activate an anti-blockage program once a week. When the anti-blockage mode is triggered, the slag discharge valve 4 at the connection between the outlet and inlet sections of U-shaped pipe 1 opens for 10 seconds. During these 10 seconds, the slurry's own gravity flushes the sediment in U-shaped pipe 1 and the pipe to the collection bin. Simultaneously, the negative pressure valve 3 opens, and the water supply pipe 2 begins to supply water, with a large amount of desulfurization process water flowing into U-shaped pipe 1. During the slag discharge process, not only are deposited impurities flushed out of the pipe, but the internal components of the pipe are also flushed and the water is replaced, effectively reducing the risk of pipe blockage and ensuring the smooth operation of the original flue gas slurry discharge pipe.

Claims

1. An automatic water replenishment and anti-clogging device for the slurry discharge pipe of the original flue gas duct in a thermal power plant, comprising the original flue gas slurry discharge pipe (7) installed near the original flue gas duct and the absorption tower, characterized in that, Includes a U-shaped pipe (1), which stores water, and a slag discharge valve (4) is provided at the lowest point of the U-shaped pipe (1). The inlet section of the U-shaped pipe (1) is connected to the original flue slurry discharge pipe (7); The curved section of the U-shaped pipe (1) is connected to a water supply pipe (2), the outlet of the water supply pipe (2) is connected to the curved section of the U-shaped pipe (1), and the water supply pipe (2) is equipped with a negative pressure valve (3); the outlet section of the U-shaped pipe (1) is connected to the subsequent process.

2. The automatic water replenishment and anti-clogging device for the original flue gas slurry discharge pipeline of a thermal power plant according to claim 1, characterized in that, The curved section of the U-shaped pipe (1) is composed of two Venturi tubes, and the outlet sections of the two Venturi tubes are connected; the water supply pipe (2) is connected at the junction of the two Venturi tubes.

3. The automatic water replenishment and anti-clogging device for the original flue gas slurry discharge pipeline of a thermal power plant according to claim 2, characterized in that, The ratio of the diameter of the outlet section to the diameter of the inlet section of the two Venturi tubes is 1:

3.

4. The automatic water replenishment and anti-clogging device for the original flue gas slurry discharge pipeline of a thermal power plant according to claim 1, characterized in that, The water supply pipe (2) is connected in parallel with a water supply branch pipe (5), and a manual valve (6) is provided on the water supply branch pipe (5).

5. The automatic water replenishment and anti-clogging device for the original flue gas slurry discharge pipeline of a thermal power plant according to claim 1, characterized in that, The negative pressure valve (3) is a negative pressure triggered diaphragm valve.

6. The automatic water replenishment and anti-clogging device for the original flue gas slurry discharge pipeline of a thermal power plant according to claim 1, characterized in that, The angle between the curved section of the U-shaped tube (1) and the horizontal plane where the outlet section of the U-shaped tube (1) is located is set to 30° to 70°.

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